The Book of the Secrets: A New Commentary, The original series of 80
discourses were simply called ”Vigyan Bhairav Tantra”. For publication
as books they were divided up into 5 volumes, called the ”The Book of
the Secrets Volume 1 - 5” (16 discourses each).The books were later
published as ”Vigyan Bhairav Tantra Volumes 1 and 2”,(40 discourses
each). The two volumes also came with a deck of 112 cards to represent
the various meditations.

One of the best exposition of Vijnana Bhairava tantra in English language is by Sri Jaideva Singh. It is also very famous book on the subject. It is one of the prime texts of Kashmir Shaivism/Shiva absolutism